12720867869641 has 4 divisors (see below), whose sum is σ = 13469154214932. Its totient is φ = 11972581524352.

The previous prime is 12720867869623. The next prime is 12720867869657. The reversal of 12720867869641 is 14696876802721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4850015175625 + 7870852694016 = 2202275^2 + 2805504^2 .

It is a cyclic number.

It is not a de Polignac number, because 12720867869641 - 2¹¹ = 12720867867593 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720867869681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374143172620 + ... + 374143172653.

It is an arithmetic number, because the mean of its divisors is an integer number (3367288553733).

Almost surely, 2^{12720867869641} is an apocalyptic number.

It is an amenable number.

12720867869641 is a deficient number, since it is larger than the sum of its proper divisors (748286345291).

12720867869641 is an equidigital number, since it uses as much as digits as its factorization.

12720867869641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748286345290.

The product of its (nonzero) digits is 97542144, while the sum is 67.

The spelling of 12720867869641 in words is "twelve trillion, seven hundred twenty billion, eight hundred sixty-seven million, eight hundred sixty-nine thousand, six hundred forty-one".